信息技术的三大支柱是什么？

阅读短文，回答问题。

         Jason Queally is one of the fastest men in the world on bicycle. But do you really call the thing in the

picture a bicycle? Well, yes, Jason's human-powered machine, With its two wheels, is, of course, a bicycle.

         Every year, a very important humanpowered bicycle is held in Nevada, USA.  The speed of a bike is

measured (测定) for only 200-metres, but players take more than a kilometre to get their bikes going fast. Jason

Queally's fastest speed for the 200metre race was 103.5 kilometres an hour.

         At this year's race, Jason failed to reach the finishing line. He was speeding along at about 70 kilometres

an hour when he began to lose control of his bike. When he tried to slow down, it began to smoke.Soon the

inside of his bike was filled with smoke.He couldn't see, and he couldn't breathe. At 70 kilometres an hour, a

crash could be very serious. Jason was frightened, but he managed to stop the bike safely. He would rapair his

bicycle and try again another time to be the world's fastest man on a bike. Better luck next time, Jason. 

         Maybe you're surprised that these bikes go so quickly, but is it useful? It could be. Cars are becoming

more and more popular, and they are very safe, comfortable and easy to drive, but they also pollute the air in

our cities. Scientists and engineers are learning from fast racing bikes how to make human-powered vehicles

that might be uesful for daily travel.

1. Is Jason's human-powered machine a bicycle?

2. How often is the human-powered bicycle race held in Nevada?

   ________________________________________________________________

3. Did Jason stop his bike safely or was he badly hurt?

    ________________________________________________________________

4. Why did he lose this year's race? 

5. What is the best vehicle for daily travel like according to the writer?

    ________________________________________________________________

I had finished supper and _____ have a bath when the power was cut off.

A．was going to.

B．was about to.

C．was to.

D．would

草绿色链球菌所致亚急性感染性心内膜炎，有肾衰竭及第Ⅷ对脑神经损伤者，所选抗生素为()

A．庆大霉素

B．万古霉素

C．青霉素

D．环丙沙星

E．头孢噻吩

肾上腺素加入局麻药溶液中的浓度应该是（）

A.100ng/ml

B.80ng/ml

C.5ng/ml

D.60ng/ml

E.8ng/ml

物业服务合同应包括（）等内容。

A、物业服务质量

B、物业服务费用

C、双方的权利和义务

D、合同期限

E、赔偿范围